G'day michael99,

I can't tell exactly the layout you're aiming for. A little bit of simple ASCII art can help to explain what you want. For instance, you currently have something along these lines:

+--+
|A1|
|A2|
|A3|
|B1|
|C1|
|C2|
+--+
[download]

Do any of these look like what you ultimately want?

+--------+  +--------+  +-----+
|A1|A2|A3|  |A1|B1|C1|  |A1|B1|
|B1|  |  |  |A2|  |C2|  |A2|C1|
|C1|C2|  |  |A3|  |  |  |A3|C2|
+--------+  +--------+  +-----+
[download]

Here's a couple of tentative suggestions:

• Perhaps changing the geometry manager from Tk::pack to Tk::grid might be helpful.
• As you talk about the checkbuttons being in columns, perhaps Tk::HList would be a useful option. If you run the widget demo — in case you don't know, that's just widget from the command line — you'll find an example (GUI demo and code) of doing this. It's under:
    Tix Widgets
      ...
      Multicolumn listbox ...

With more information from you, better suggestions may present themselves.